Intel Xeon E5 2637 's Advantages
Higher base frequency (3GHz vs 2.3GHz)
Lower TDP (80W vs 215W)
Xeon 6556P B 's Advantages
Released 12 years and 11 months late
Higher specification of memory (6400 vs 3)
Newer PCIe version (5 vs 3)
Larger L3 cache size (144MB vs 5MB)
More modern manufacturing process (5nm vs 32nm)